$3xy-5xy+xy$
$y^2-8y+18=0$
$18\sqrt{4}+47\sqrt{4}$
$\left(x+6\right)\left(x-6\right)+\left(x+7\right)\left(7-x\right)$
$12x^2-4x-5$
$5\left(2x-3\right)+2>3\left(x+4\right)+3$
$\lim_{x\to3}\left(\frac{d-3}{d^2-9}\right)$
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